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[amdgcn] Add support for sub-word sync_compare_and_swap operations

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2020-01-09  Kwok Cheung Yeung  <kcy@codesourcery.com>

	libgcc/
	* config/gcn/atomic.c: New.
	* config/gcn/t-amdgcn (LIB2ADD): Add atomic.c.

From-SVN: r280055
This commit is contained in:
Kwok Cheung Yeung 2020-01-09 15:35:14 +00:00 • committed by Kwok Cheung Yeung
parent bad5e58a9f
commit d6491d1567
3 changed files with 67 additions and 1 deletions
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5
libgcc/ChangeLog
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@ -1,3 +1,8 @@
2020-01-09 Kwok Cheung Yeung <kcy@codesourcery.com>
* config/gcn/atomic.c: New.
* config/gcn/t-amdgcn (LIB2ADD): Add atomic.c.
2020-01-08 Georg-Johann Lay <avr@gjlay.de>
Implement 64-bit double functions.

60
libgcc/config/gcn/atomic.c Normal file
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/* AMD GCN atomic operations
Copyright (C) 2020 Free Software Foundation, Inc.
Contributed by Mentor Graphics.
This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include <stdbool.h>
#include <stdint.h>
#define __SYNC_SUBWORD_COMPARE_AND_SWAP(TYPE, SIZE) \
\
TYPE \
__sync_val_compare_and_swap_##SIZE (TYPE *ptr, TYPE oldval, TYPE newval) \
{ \
unsigned int *wordptr = (unsigned int *)((uintptr_t) ptr & ~3UL); \
int shift = ((uintptr_t) ptr & 3UL) * 8; \
unsigned int valmask = (1 << (SIZE * 8)) - 1; \
unsigned int wordmask = ~(valmask << shift); \
unsigned int oldword = *wordptr; \
for (;;) \
{ \
TYPE prevval = (oldword >> shift) & valmask; \
if (__builtin_expect (prevval != oldval, 0)) \
return prevval; \
unsigned int newword = oldword & wordmask; \
newword |= ((unsigned int) newval) << shift; \
unsigned int prevword \
= __sync_val_compare_and_swap_4 (wordptr, oldword, newword); \
if (__builtin_expect (prevword == oldword, 1)) \
return oldval; \
oldword = prevword; \
} \
} \
\
bool \
__sync_bool_compare_and_swap_##SIZE (TYPE *ptr, TYPE oldval, TYPE newval) \
{ \
return __sync_val_compare_and_swap_##SIZE (ptr, oldval, newval) == oldval; \
}
__SYNC_SUBWORD_COMPARE_AND_SWAP (unsigned char, 1)
__SYNC_SUBWORD_COMPARE_AND_SWAP (unsigned short, 2)

3
libgcc/config/gcn/t-amdgcn
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@ -1,4 +1,5 @@
LIB2ADD += $(srcdir)/config/gcn/lib2-divmod.c \
LIB2ADD += $(srcdir)/config/gcn/atomic.c \
$(srcdir)/config/gcn/lib2-divmod.c \
$(srcdir)/config/gcn/lib2-divmod-hi.c \
$(srcdir)/config/gcn/unwind-gcn.c